1911 Slides & Hardened Steel
The classic premium engrave job: names, scripture, scrollwork on 1911 slides. Hardened steel means slow, multi-pass settings.
Verified 2-pass formula (60W MOPA, 70mm lens)
Adapted from the community-proven 50W Raycus formula. Derated slightly for the 60W MOPA's slightly higher average power.
| Pass | Speed | Power | Freq | Pulse | Loops | Line | Hatch |
|---|---|---|---|---|---|---|---|
| 1: engrave | 200-400 | 85% | 50 kHz | 200 ns | 15-20 | 0.03 | Cross-hatch 0°/90°, auto-rotate 30° per loop |
| 2: clean-up | 1500 | 35% | 50 kHz | 200 ns | 3 | 0.04 | single direction |
Glock slide: surface only
Glock's Tenifer/Melonite-nitrided surface is a case-hardened layer with a compound layer of approximately 5-15 µm sitting over a deeper diffusion zone (~50 µm total case depth). Surface hardness is commonly cited at ~64 HRC, though the HRC scale is unreliable above HRC 65; some references give 640-680 HV. Glock switched from the original Tenifer salt-bath process to gaseous ferritic nitrocarburizing around 2010, so modern Glocks may not be true Tenifer, but the surface behavior is similar. The case is what gives the slide its corrosion resistance. You can mark it (surface oxidation) but you should NOT deep-engrave through it. Customers expect surface marking. That's the standard offering for Glock slides.
| Speed | 800-1200 mm/s |
| Power | 40-60% |
| Frequency | 35 kHz |
| Pulse | 200 ns |
| Line interval | 0.02 mm |
| Loops | 1-2 |
This gives a frosted-gray mark with the corrosion-resistant nitride layer intact.
Cerakoted / Duracoated slides
The cosmetic coating ablates cleanly off any underlying metal. White-on-color appearance with no damage to the steel below.
| Speed | 1500-2500 mm/s |
| Power | 25-45% |
| Frequency | 35 kHz |
| Pulse | 200 ns |
| Line interval | 0.02 mm |
Test the corner of the slide first. Cerakote thickness varies, and you want to ablate cleanly without scoring the metal underneath (bad for re-coating). For the full coating-ablation workflow including pre-coat vs post-coat order of ops, settings by substrate, customer-comms script, and pricing. See Cerakote Ablation: Coating-Removal Engrave Workflow.
Stainless 1911 / SIG (uncoated)
Stainless engraves cleaner than blued steel. No coating to manage. The surface takes a sharper mark. Use the standard 3-pass formula from Deep Engraving, dropping speed to 1000 mm/s and loops to 12-15 per pass on a 60W MOPA.
Finish drives the recipe, not the brand
Customers think in brand names (Colt, Springfield, Wilson, Kimber, Ruger, Sig, Staccato). For engrave settings, what matters is the slide's finish and substrate, not the badge on the box. Identify the finish before quoting.
| Finish / substrate | Engrave behavior | Recipe family |
|---|---|---|
| Carbon steel, blued or parkerized | Engrave-through to bare metal; mark reads as silver-on-black contrast | 2-pass formula above; ~38-42 HRC typical |
| Stainless steel, brushed or matte | Clean dark frosted mark on bare metal | 3-pass deep engrave; drop speed for hardness |
| Stainless steel, polished / mirror | Same recipe as brushed, but the mirror finish telegraphs ANY focus error or hatch banding. Demand premium pricing or refuse. | 3-pass deep engrave; pristine focus required |
| Melonite / nitrided (some Springfield, Kahr, FN, certain Glock-pattern 1911s) | Surface mark only, like a Glock slide. Going through the case-hardened layer kills corrosion resistance. | 1-2 surface loops; SAME risk language as Glock-slide section above |
| Cerakote / Duracoat / Armor-Tuff (Wilson) / other applied coating | Ablate through the coating to reveal substrate below; classic white-on-color look | Coating-ablation settings; see Cerakote table above |
| DLC / PVD coating (some high-end production slides) | Ablation possible but coating is harder and thinner than Cerakote; risk of substrate scoring is higher | Test on hidden surface first; reduce power 20% relative to Cerakote starting point |
If the customer can't tell you the finish, ask for high-resolution photos of the slide under raking light. Polished vs brushed vs matte vs coated is usually identifiable from a clear photo. If you can't identify the finish from photos, refuse the job or charge a discovery-and-test premium. A "I think it's stainless" guess that turns out to be melonite is exactly how shops produce permanent customer-property damage.
What customers actually ask for on slides
- Single-line text (name, date, monogram, single word): the most-requested job. Top of slide between rear sight and rear cocking serrations is the standard placement. Quick, low risk, broad appeal.
- Multi-line text (scripture, quote, dedication): flat sides of the slide are the canvas. Plan two passes if you want any depth on hardened steel. Watch line spacing carefully against the curve.
- Custom logo or simple scrollwork: customer-supplied vector art; flag any trademark / brand concerns BEFORE quoting (Disney, Punisher, military insignia rules apply).
- Full scrollwork (filling slide flat sides edge-to-edge): premium tier; expect 30-60 minute engrave time per side and matching pricing.
- Rear slide plate engraving: technically not on the slide itself; rear plate is a slip-on accessory part. Different workflow, different liability tier (the plate is cheap to replace). See High-Sales Items for the slip-on plate market context.
- What customers ask for that you should usually refuse: engraving directly over an existing factory rollmark, engraving on the chamber area, anything that obscures the manufacturer's serial number (federal violation), and any work on a slide that's been previously refinished poorly (surface is unpredictable).
Pricing
See the consolidated Firearms pricing reference in the Firearms Engraving Primer.
Curved slide geometry: the gotcha
Slides are slightly curved across the top and along the length. The 70mm lens (±0.4mm DOF) is too tight, your edges will be out of focus across the curve. Three options:
- 150mm lens: looser DOF (±1.2mm) handles the curve, but spot is bigger.
- Z-step within the job: split the design into 3 strips along the slide, run each at its own Z height. Tedious but high quality.
- Engrave only the flattest portion: most slide art is on the flat back portion of the slide where curve is minimal.
Lens field size vs. slide length: run the math
Curvature is not the only lens consideration. The slide LENGTH has to fit inside the lens FIELD if you want to engrave the full side in one zone. The 2-pass formula at the top of this module uses a 70mm lens because that is the right lens for small engraves within the slide (names, monograms, dates, short single-line text) where you do not need to span the whole side. For full-side scrollwork or multi-line text that runs edge-to-edge, you need a bigger lens.
| Slide | Slide length | Fits 70mm? | Fits 110mm? | Fits 150mm? |
|---|---|---|---|---|
| 1911 Government (5" barrel) | ~127mm | No | No | Yes, with margin |
| 1911 Commander (4.25" barrel) | ~108mm | No | Marginal | Yes, comfortable |
| 1911 Officer / Defender (3.5" barrel) | ~89mm | No | Yes | Yes |
| Glock 17 slide (for context) | ~186mm | No | No | No (needs 200mm+ or diagonal) |
Practical lens guidance for 1911 work:
- 70mm lens: small engraves (single line text, monograms, dates, small logos that fit inside a 70x70 zone). The verified 2-pass formula at the top of this module is calibrated for the 70mm spot.
- 110mm lens: Officer-length slides full-coverage, or Commander-length with split-pass workaround. Does not fit a Government slide in one zone.
- 150mm lens: the right lens for full-slide scrollwork or multi-line text on any 1911 size up to Government. Pair with the DOF benefit for the curved slide top.
Font and design notes
- Font sizing: 3-4mm character height for body text. Below 2.5mm and stainless's grain texture overwhelms readability.
- Spacing: 0.35mm letter spacing for serif fonts (Courier New / Garamond) on slides, community standard.
- Avoid hairline scrollwork below 0.15mm stroke width. Won't reliably engrave on hardened steel.
Settings are community-validated starting points, not guarantees. Hardness, finish, and metallurgy vary by manufacturer, lot, and refinish history. Always test on a scrap of similar finish before running on the customer's slide. Federal serial-number rules current as of 2026; never alter or obscure a manufacturer's serial number.